Piston of composite material with C-shaped ring groove

Details Piston of composite material with C-shaped ring groove Piston of composite material with C-shaped ring groove

1990-04-24

1992-06-02

Look, Edward K.

Expansible chamber devices

With differential radial thrust producing means for working...

92212, 92248, 277136, 277216, F01B 3100, F16J 900

Patent

active

051177420

ABSTRACT:
The present invention relates to an oilless reciprocating compressor and expansion apparatus each comprising a piston body to which a piston ring made of a self-lubricating material is fitted and a metal cylinder, and in the first invention and the second invention a self-lubricating material can be formed on the piston itself or on the circumferential surface side thereof without influencing adversely the durability of the piston itself by the compression heat at the piston top, and in the third invention a ring groove formed into the shape of the letter C whose ends are spaced a little is provided in the piston circumferential surface at least whose surface side is made of a self-lubricating material, and said ring groove is positioned on the side thrust line orthogonal to the piston pin, so that the compression efficiency is improved.

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